MOUNTAIN OFF ROAD ENTERPRISES, LLC.
P.O. BOX 690 DELTA, COLORADO 81416
970-625-0500
970-625-3747 FAX
www.mountainoffroad.com
INSTALLATION INSTRUCTIONS for JM25840 BombProof™ MOTOR MOUNTS
Please read and understand all instructions before beginning the installation of these motor mounts. Please read
the terms and policies on the back of these instructions.
The JM25840 motor mounts are designed to fit the following Jeep® vehicles: 1987-1995 YJ Wranglers equipped
with 6-cylinder engines (4.0L or 4.2L), 1997-2006 Jeep® TJ & LJ Wranglers equipped with 4.0L engines, 1987-
2001 Jeep® XJ* (Cherokee), MJ* (Comanche) equipped with 4.0L engines. The design is such that you will
notice more vibration then the stock rubber motor mounts, mostly at idle. However, the fact that the en-
gine will be “clamped” in place far better then the stock mounts is worth the slight increase in vibration.
* The XJ and MJ Jeep® vehicles will have severe vibration, due to the uni-body design. Do not install
unless you do not care about this fact!!! You have been warned!
STEP 1: With the Jeep® on flat level ground, apply the parking brake, block the tires so it cannot move.
Put the transmission in neutral. Using a jack, place a block of wood between the jack and the oil pan. Apply a
slight amount of pressure on the oil pan.
STEP 2: Remove the drivers side stock motor mount. Save the hardware that you removed because it
will be re-used. Install the BombProof™ motor mount in it’s place. (On some models of Jeep® vehicles we
have found that the factory does not machine the block mounting “fork” deep enough for the BombProof™ mount
to fit into it. This means that you must grind the “fork” until it does fit! See above photo.) Do not tighten any of
the nuts or bolts at this time. If your vehicle has a aftermarket suspension lift kit that uses spacers between the
skid plate and frame to lower the transfer case, this can cause the motor mounts to be slightly out of alignment.
If you have trouble lining-up the thru-bolt, it may be necessary to temporarily un-bolt the transmission mount from
the skid plate and raise the transmission up slightly until the thru-bolt lines up.
STEP 3: Remove the stock motor mount from the passenger side of the engine. Install the BombProof™
motor mount in it’s place. (On some models of Jeep® vehicles we have found that the factory does not machine
the block mounting “fork” deep enough for the BombProof™ mount to fit into it. This means that you must grind
the “fork” until it does fit! See above photo.) Re-use the stock hardware. Do not tighten the nuts or bolts yet. If
you had un-bolted the transmission mount from the skid plate in step 2, you can now lower it back into place and
tighten the bolts that you removed.
STEP 4: Tighten the bolts and nuts on the bottom of the BombProof™ motor mounts to factory specs.
Tighten the thru-bolts on the engine mounting “fork” to factory specs. Remove the floor jack. Check all of the
hardware for proper torque specs after 50 miles and every off-road use. Thank you for purchasing your Bomb-
Proof™ motor mounts from M.O.R.E.™.
You may need to grind clearance in this area to
allow the BombProof™ mount to fit into the fac-
tory “fork”. More common on YJ’s.
(8 pages)
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